00:00Black holes hold some of the universe's greatest mysteries, with giant seemingly empty spots
00:09in space, sucking in whatever enters their gravitational pull.
00:12However, the mystery is now growing, as astronomers are now saying there could be a swarm of black
00:17holes moving across the Milky Way.
00:19A stellar cluster named Palomar 5 includes a cascade of stars stretching over an area
00:24some 30,000 light years in length.
00:26It's what's called a tidal stream, forming in a different and unknown way from normal
00:30globular clusters, and Palomar 5 is the only one we've found so far.
00:35Experts theorized that black holes might have something to do with tidal stream cluster
00:39formation, so they included them in simulated models, and the resulting data revealed that
00:43a cluster of black holes within Palomar 5 could be to blame for its wild orientation,
00:48with the researchers adding, quote, the number of black holes is roughly three times larger
00:52than expected from the number of stars in the cluster, and it means that more than 20
00:56percent of the total cluster mass is made up of black holes.
01:00Each of the black holes within Palomar 5 is around 20 times the mass of the sun, and in
01:04around a billion years, the simulation revealed that only the black holes will remain, providing
01:09clues about how tidal streams form, and why we haven't found any more of them.
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